The second part ( including the third, four chapters) is the basic research part.
第二部分（包括第三、四章）是基础研究部分。
The second part of the body is divided into four chapters.
第二部分正文共分为四章。
Chapters two and three are the second part and key content.
第二、三章是第二部分，是本文的重点内容。
The second part is the "main part", including three chapters.
第二部分为研究的“主体部分”，包括三章内容。
The second part (including the third, four chapters) is the basic research part.
第二部分(包括第三、四章)是基础研究部分。
The second part includes four chapters.
第二部分包括正文四章。
The second part, text, will be divided into three chapters.
第二部分正文将分为三章进行论述。
The second part has three chapters altogether.
第二部分一共有三章。
The second chapter is the core issue of our paper, and divided into three chapters.
第二部分为本文的第三章到第五章，是本文的核心内容。
The second part covers five chapters.
第二部分共包括五个章节。
The second part is the Main body, three chapters.
第二部分是正文，共三章。
Second is the main body, which contains three chapters.
其次是主体部分，主体分三章进行。
The second part is the main text, which divides into four chapters.
第二部分为正文，共分为四章。
The second part of the body, is divided into four chapters.
第二部分是正文，共分四章。
The second section is the article of the main chapters.
第二板块即文章主体章。
The second part (the third and fourth chapters) is the key part of this paper.
第二部分（第三、第四章）是本论文的重点部分。
The second part (the third and fourth chapters) is the key part of this paper.
第二部分（第三、第四章）是本论文的重点部分。
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